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Round 1 Coding Questions: Write a program to count the number of binary 1s in a number. Example: For 7 → Output should be 3. Write a program to check whether the given input contains valid parentheses. SQL Question: List all employees whose salary is greater than the average salary of their respective department. Scala Theory Question: What is implicit in Scala? Spark Questions: How do you copy data from HDFS to the local file system? What is the command for spark-submit? What is the difference between reduceByKey and groupByKey? What happens during a broadcast join in Spark, and how does it reduce shuffling? What happens when we use the collect() action in Spark? How do you define the minimum and maximum number of executors in Spark?
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Senior Data Engineer

Interviewed at Visa Inc.

3.8★
Jul 14, 2025

Round 1 Coding Questions: Write a program to count the number of binary 1s in a number. Example: For 7 → Output should be 3. Write a program to check whether the given input contains valid parentheses. SQL Question: List all employees whose salary is greater than the average salary of their respective department. Scala Theory Question: What is implicit in Scala? Spark Questions: How do you copy data from HDFS to the local file system? What is the command for spark-submit? What is the difference between reduceByKey and groupByKey? What happens during a broadcast join in Spark, and how does it reduce shuffling? What happens when we use the collect() action in Spark? How do you define the minimum and maximum number of executors in Spark?

SQL : 1. create Pivot tables, 2. find the sequence gap and aggregate the result python: 1. Tricky python questions like function and their output 2. Normal and basic level of coding Pyspark: 1. Please check this topics of pyspark Windows functions , date_diff, case when , watermark and aggregation
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Senior Data Engineer

Interviewed at TELUS

3.5★
Oct 17, 2025

SQL : 1. create Pivot tables, 2. find the sequence gap and aggregate the result python: 1. Tricky python questions like function and their output 2. Normal and basic level of coding Pyspark: 1. Please check this topics of pyspark Windows functions , date_diff, case when , watermark and aggregation

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